Oracle error log file

I'm running following block in Oracle (what does it do is not so important)

BEGIN
开发者_如何学Python  SDO_RDF_INFERENCE.CREATE_RULES_INDEX(
    'my_index',
    SDO_RDF_Models('my_model'),
    SDO_RDF_Rulebases('RDFS'));
END;

and getting following error:

ORA-29532: Java call terminated by uncaught Java exception: java.lang.NullPointerException
ORA-06512: at "MDSYS.RDF_APIS_USER", line 7
ORA-06512: at "MDSYS.RDF_APIS_USER", line 9
ORA-06512: at "MDSYS.RDF_APIS", line 477
ORA-06512: at line 2
29532. 00000 -  "Java call terminated by uncaught Java exception: %s"
*Cause:    A Java exception or error was signaled and could not be
           resolved by the Java code.
*Action:   Modify Java code, if this behavior is not intended.

Question: how can I access Oracle error log or something to get full stack trace or any other information about exception.

Usually only DBA's have essential rights to view Oracle logs. But,If you have enough rights:

select value from v$parameter t
where t.NAME='background_dump_dest'

This query will return the file path of the Oracle alert log and trace\dump files at Oracle Server machine. Alert log (Alert_"databasename".log) chronologically records messages and errors and containes pointers to trace\dump file assosiated whith them.

Also you can view alert_.log using Oracle Enterprise Managment Console following the "Alert Log Contents" link in the target database.

This doesn't answer the question on how to see more info in the log, but you may want to look at this for some possible reasons for the error. Usually happens because you have not been granted permission to the Oracle object you are trying to access.

Try execute this statement in your Oracle SQL session before calling the failing stored procedure:

dbms_java.set_output(32000);

It will cause the Oracle JVM to append a Java stacktrace to the DBMS output, which you can then examine in more detail.